Fig. 1. Musculo-skeletal morphology of the hindlimb and muscles of interest. (A) Ventral view of the cockroach with the left hindleg in bold. (B) Dorsal, medial and ventral views (from left to right, respectively) of the left hindlimb. Muscle 178 (blue, shaded) inserts on the trochanter and originates on the dorsal side of the coxa closest to the body. The center image represents lateral view from the midline of the animal to clearly show the positions of the muscles. Muscle 179 (red, unshaded) inserts on the trochanter and originates on the ventral side of the coxa. Note that the moment arms are similar between the muscles, but muscle 178 is slightly shorter in length (see Table 1) and slightly broader with greater cross-sectional area. The circles in the dorsal and ventral views of the hindlimb indicate the axis of rotation of the joint.